Drafting instrument



July 3, 1923. c. F. GOLDEN DRAFTING INSTRUMENT Filed Aug. 30. 1922 Patented July 3, 1923.

vireo cHAn ns FREMONT GOLDEN, or nnnv-nnfrnnrenn.

nna'rrrne INSTRUMENT.

v Application filed August 30, 1922. Serial 1101585488;-

angles, and for laying down transverse courses and the like. a 2

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangements of parts and in the details of construction hereinafter described and claimed, it being understood that 7 changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings Figure 1 represents a top plan of the instrument constructed in accordance with this invention.

Fig. is a longitudinal section taken on the line 2-2 of Fig. 1, and I Fig. 3 is a fragmental elevation showing a modified form of arm.

The instrument constituting this invention may be of any de'sired'materialand comprises a main member 1 composed of a body 2 and a transverse head 3, which latter may be in the form of a 'protractor. The fiducial edges of the body 2- are shown at 4: and 5 and scales 6 are provided adjacent said edges and may be made in any desired way, no specific form of scale being shown because they may be made in any preferred form.

The straight edge 7 of the'head 3 is located at right angles to the edges 4 and 5 to facilitate the laying 01f of right angles. The

head 3 is provided adjacent the edge 7 with; a'scale 8 which may be constructed in accordance with the will of the user or manufacturer. The curved edge 9 of the head 3 constitutes the usual element of a protractor and is provided with a degree scale 10 reading in opposite directions from a zero point, which is alined with the edge 4 of the body 3. The body 2 is provided on itsunder side wi h. a longitudinal groove- 11 and witha longitudinal slot 12 communican,

ing with said groove. threaded opening 14. formedin the end '6 remote from the'head 3. v v

A carriage 15 is preferably mounted for 'The'body 2 has a A adjustment-on tliebody 2 and includes a base plate 16 resting on the body 2and'hav-, a

ingupstanding flanges 17 provided with indices '18. Thefianges 17 have openings 19.

formed therein and a'screw 20 extends upwardly. through the-slot 12 of *the body .2 and through the base plate 16 0f .the carriage 15, the head 21 of the screw being housed in the groove 11 and bearing against the body 2. Anut 22 is threaded onthe screw 20 and is adapted to engage thejbase plate 16 ofthe carriage 15, the screw and the nut constituting a clamping device for hold-.

ing the carriage 15 adjusted position on, I

the body 2.

A micrometerscrew 23 is mounted loosely in the openings 19 of the flanges 17, and has a micrometer nut 24 threadedv thereon and disposed between said flanges, said'nut having a circumferential scale 25 130 cooperate ently to be described.

- with the indices 18 on the flanges 17. At its forward end, the micrometer screw 23 is supplied with an enlarged head 26 having a cir+ cumferential groove 27 for a purpose pres' A rider 28 is mounted on the'body 2 for longitudinal adjustment and is provided;

with a laterally extending wing 29L The rider 28is equipped with anuupstanding flange 30 having a knot or seat 31 to receive the grooved portion 27 of the head'26 of the screw 24, whereby the screw is connected 1 with the rider for rotation, but is held against longitudinal movement independently of the rider.

A screw 32 extends upwardly through the slot 12 of the body 2 and through the rider' 28, and is equipped-with a head 30located in the groove 11 of body 2 and engaging said body,

clamping means for holding the rider in ad justedposition longitudinally of the body.

The rider 28 carries a stylus holder 35 which may be of any desired construction.

A nut 3 1 is threaded on the upper I end of the screw 32 and bears against the' rider 28, the screw and nut constituting A bracket 52 is mounted on the head'3 and i into which is threaded the neck 53 of the casing 54. On cap 56.

11 0 the casing 54: ismount'ed a a A plunger 62 is mounted to slide in the cap 56 and carries a center point which is designed to be operated properly with re-' spect to a point of reference. a

A flexible arm 70 has an opening 71 therein to provide for its removable mounting on the casing 54 for swinging movement. This arm 70 has an extension 72 prolonged to overlie the protractor head 3 and adapted to cooperate with the scale 10 thereof. The fiducial edge of arm 70 is indicated at 73, while at its free end oflt set edges 74 are provided and adjacent said edges marks 75 are formed to indicate fractions of a degree in minutes or otherwise.

In an instrument of this character it is not possible to lay down any hard and fast rules relative to the method of operation, since a device of this sort is ordinarily committed to persons having their own methods of procedure and capable of devising such' methods as the work in hand demands.

In operations which do not call for a reading determined by the relation existing between the arm 70 and the scale 10 of the protractor 3 an arm 86 may be used having an opening 87 for the reception of the part 54. the extension 72 being omitted.

I claim In an instrument of the class described, a main member comprising a body and a head, the head having a protractor scale and an arm pivoted to the main member and cooperating with the body to define angles, the arm being provided with laterally offset edges forming sub-divisions of the unit of the protractor scale.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

CHARLES FREMONT GOLDEN.

Witnesses:

NOBLE B. HUNT, RUTH HAY. 

